Whenever possible, use the speaker-phone mode or a wired headset (not a Bluetooth).
有可能的话，通话时尽量使用免提扬声模式或有线耳机(不是蓝牙)。
2
There she chatted, on speaker-phone, to her faraway mother, who said, of course, that it would be better if her daughter and grandchild stayed safe in the south.
她在厂里用免提电话跟远方的母亲聊天。当然了，她母亲说，如果女儿和外孙能够平安地呆在南方，那样更好。
3
Whenever possible, use the speaker-phone mode or a wireless Bluetooth headset, which has less than 1/100th of the electromagnetic emission of a normal cell phone.